Recondition a Battery

Here’s some information that Phil came across and thought that we’d share with you: How to Recondition a Battery



  1. Magnesium Sulfate (EPSOM SALT), ten heaping tablespoons
  2. Distilled Water, one gallon. MUST BE DISTILLED not tap water,

These materials are available from a drug store or Walmart.

1. Drain battery enough to be able to add one quart of fluid. Consider that battery may be low on fluid so adding this solution will not overflow the battery and use best judgment. If you drain too much, you can always fop off with the distilled water.

2. Warm up the distilled water to about 150 degrees (very hot but not boiling). The temperature doesn’t need to be exact by any means and will still work even if the water is at room temperature, it just won’t work as well.

3. Mix 10 heaping tablespoons full of Epsom Salt into the water and stir until it is dissolved.

4. Pour this warm solution into your battery where you would normally put water to maintain the acid levels. Do not attempt to put Epsom Salt directly into your battery because it will not dissolve into the battery acid, only water will dissolve Epsom Salt.

5. Replace caps and charge overnight.

It is only recommended to add 1 quart of the solution to an average size battery. After adding the solution it is recommended to put the caps back on and shake the battery a bit to mix all the chemicals.

If the battery does not appear to have good capacity after an overnight charge, don’t give up. Sometimes it takes a week to 10 days for the Epsom Salt solution to work on the battery plates. Agitation is also important. It is difficult to have the Epsom Salt solution thoroughly mix with battery contents because of the battery plates and baffles. One of the best mixing methods is to simply drive the vehicle (if the battery works at all)

Some batteries have caps that come off the top to maintain the acid levels easily but many Low Maintenance batteries require a bit more work to recondition. A low maintenance battery has its top sealed shut to poverty evaporation but it also prevents easy reconditioning. These batteries can still be reconditioned but you will have to look for the “shadow” marks on the top plastic that shows the holes into the cells Simply drill holes in the plastic to get access to the calls then pour in your warm solution. You will then want to plug these holes with plastic hole caps that can be found at most hardware stores. When purchasing a new battery it is recommended to look for the batteries that you can easily maintain in the future. It is also recommended to purchase a small solar charger to keep your unused batteries charged over the winter to prevent this problem from happening in the future. This method works most of the time but not all the time it depends on how bad the cells are decayed. This process can also only be done 2 to 3 times before the cops are worn out.


So how does this work, and what is the success rate? When a battery loses its state of charge It has become more of a base than an acid, so the electrical power it generates through the chemical reaction of the magnesium sulfate and the lead plates inside the battery has been reduced

By adding water instead of the proper chemical solution they are accomplishing nothing. So, unless the lead plates inside your battery have broken off which is rare, this procedure always works. The success rate is about 98%. (on batteries that have never had this treatment). Thus far have done this to about 150 batteries (mainly golf carts) only 3 have failed.

However. I’ve found this can only be 2 to 3 times before the battery is no longer able to be resurrected. Considering the minimal cost of materials to 4 dollars) I think this is well worth trying.

I’m not sure who to credit with the information… if you know the original source please let us know in the comments below.

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